318/410 What do you think (posting for a friend not my engine)

Stock EQ heads? Not ported?
Cam duration is what now?
Type of cam? (Lifter style)

Sonic check the block for its maximum obtainable safe over bore. I don’t think you can go that far.

Not a fan of the intake and if the heads are stock, unported, why even bother with the build? While it will out torque any OE bore and stroke it will not HP them in any meaningful manor.
IF I was to make a suggestion (and here it is...) it would be to sell the heads and intake to roll the money over into a set of Trick Flow heads (rocker ratio of your choice) and a Edelbrock AG.

NOW! We are going to make some steam!
That would be worth the hassle and waiting time. He will long forget the price differences and wait time white the perma grin he will gain.